Document copying deterrent method using line and word shift techniques
First Claim
1. A method of deterring illicit copying of electronically published documents, comprising the steps of:
- electronically creating a plurality of copies of a document for distribution to a plurality of subscribers;
encoding each of said plurality of copies of said document with a unique identification code, said identification code being based on a combination of line-shift coding and word-shift coding; and
creating a codebook to correlate each such identification code to a particular one of said plurality of subscribers.
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Accused Products
Abstract
A method is provided that deters the illicit copying of electronically published documents. It includes publishing a plurality of copies of electronically created material to be distributed to a plurality of subscribers. Each copy of subscriber'"'"'s document has a unique identification code embedded in the document. The arrangement of the code on the document is based on the line-shifting and word-shifting techniques. This is to minimize the effects from noise and distortions on future illicit copies to simplify detection and decoding of the unique code. A codebook is created to correlate each unique code with each subscriber.
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Citations
16 Claims
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1. A method of deterring illicit copying of electronically published documents, comprising the steps of:
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electronically creating a plurality of copies of a document for distribution to a plurality of subscribers; encoding each of said plurality of copies of said document with a unique identification code, said identification code being based on a combination of line-shift coding and word-shift coding; and creating a codebook to correlate each such identification code to a particular one of said plurality of subscribers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of deterring illicit copying of a electronically published document, comprising the steps of:
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detecting a unique identification code on a copy of said electronically published document; and comparing said detected unique identification code on said copy of said electronically published document to a codebook to determine a particular one of a plurality of subscribers to which said unique identification code correlates, said identification code being based on a combination of line-shift coding and word-shift coding. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification